Top Principal Software Engineer Jobs in Chicago, IL

Lead the design and implementation of full-stack applications using C#/.NET and ReactJS. Mentor developers, optimize performance, and ensure high-quality solutions through collaboration and best practices.

Enhance and maintain software products, develop new products, participate in the full development life cycle, and troubleshoot software issues.

As a Principal Software Engineer, you'll architect scalable APIs, support dataset curation, and mentor team members, driving AI innovation.

Lead platform initiatives as a Principal Software Engineer, focusing on core identity services while driving technical innovation and collaborating across teams.

The Principal Software Engineer will build a cloud-first command and control platform, integrating existing capabilities and automating efficiency in mission planning.

The Principal Software Engineer (Backend) will design, develop, and maintain scalable backend services using Python, collaborate with teams to integrate AI/ML features, optimize performance, mentor engineers, and ensure API security and compliance.

As a Principal Software Engineer, you'll lead engineering initiatives, design and develop product functionality, and mentor teams, focusing on high-quality outputs and cultural excellence.

As a Principal Software Engineer at TCGplayer, you will guide architectural direction and oversee the migration to microservices. Your responsibilities include developing high-quality code, creating documentation, collaborating on technical requirements, and contributing to mission-critical applications while inspiring your peers.

The Principal Software Engineer will design, develop gameplay and UI systems in Unreal Engine, collaborating with various teams to implement game features and maintain engine code for an MMO.

Lead the design and optimization of backend services, mentor teams, architect APIs, and integrate data systems while ensuring high performance and scalability.

As a Principal Software Engineer, you'll lead and mentor a team, drive product development, and ensure high-quality releases within a rapidly growing fintech startup.

The Principal Software Engineer leads cross-platform development and creates innovative, data-driven digital experiences, focusing on scalable software solutions and architecture.

Design, implement, and test scalable services and APIs while providing technical leadership and mentoring team members in a collaborative environment.

Drive the technical vision and architecture for CoinTracker, solving complex challenges around performance, mentoring engineers, and leading technical initiatives.

The Principal Software Engineer will design, develop, and implement high-quality software solutions, lead teams, and manage integrations while ensuring security and stability.

Lead architectural design and development of software solutions at Unstructured, mentoring teams and solving complex technical challenges for AI/ML pipelines.

As a Principal Software Engineer, lead the design and development of the ad-serving platform, integrating innovative AWS technologies and collaborating with cross-functional teams to enhance user engagement.